Head-motion for concentrating-tables



NCENTRATING TABLES.

APPUCATION FILED MAR. 18. 1918.

Patented Mar. 2 1920.

2 SHEETS-SHEET 1.

H. BOLTHOFF.

NCENTRATING TABLES.

APPLICATION FILED MAR. 18, 1918.

HEAD MOTION FOR C0 Patented Mar. 2, 1920.

2 SHEETS-SHEET 2.

J! ear 01700790? UNITED STATES PATENT OFFICE.

HENRY BOLTHOFF, OF DENVER, COLORADO.

HEAD-MOTION FOR' GONGENTRATING-TABLES.

Specification of Letters Patent.

Patented Mar. 2, 1920.

Application filed March 18, 1918. Serial No. 223,053.

To all whom it may concern:

Be it known that I, HENRY BOLTHOFF, a citizen of the United States, residing at the city and county of Denver and State of Colorado, have invented certain new and useful Improvements in Head-Motions for Concentrating-Tables; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in" the art to which it appertains to'make and use the same, reference being had to the accompanying drawings, and to the characters of reference marked thereon, which form a part of this specification.

My invention relates to improvements in head motions for concentrating tables, my object being to provide a construction adapted to impart the proper differential movement to tables of this character for the purpose of stratifying the material on the table and causing the concentrates to travel there across in one direction, while the gangue or tailings are carried in a direction approximately at right angles to the travel of the rconcentrates, thus effecting the proper separation of the" metallic values from the gangue with which they are mingled in their natural state.

My further object is to provide apparatus of this class which shall be simple in construction, economical in cost, reliable, durable, and efficient in use, and to this end my improvement consists of the features, arrangements and combinations hereinafter described and claimed, all of which will be fully understood by reference to the accompanying drawing, in which is illustrated an embodiment thereof. In this drawing:

Figure 1 is a fragmentary top plan view of a table showing my improved head motion applied.

Fig. 2 is a vertical section taken on the line 2-2, Fig. 3, looking toward the left.

Fig. 3 is a transverse section taken on the line 33, Fig. 1, looking toward the right.

Fig. 4 is a fragmentary, perspective view of my improved head motion showing the parts on a larger scale than in the other views.

The same reference characters indicate the same parts in all the views.

Let the numeral 5 designate a concentrating table or other apparatus to which my improved head motion may be advantageously applied. This table is supported at points relatively remote from the operating shaft 6, by upwardly projecting leaf springs 7 whose lower extremities are secured, as

shown at 8, to a stationary substructure or frame work 9, the upper extremities of these springs engaging V-shaped sockets 10 formed in depending parts 12 with which the table is provided. The table is further supported at oints adjacent the operating shaft 6 by spiral springs 13 sur rounding rods 14, their upper extremities engaging lugs 15 which are secured directly to the adjacent part of the table, the lower extremities of the springs engaging stops in the form of tension nuts 16 which are threaded on the rods. These springs are under suflicient tension to properly support the table for a purpose hereinafter described and set forth more in detail.

The operating shaft 6 as shown in the drawing, is provided with a bushing 17 which is secured to the shaft in any' suitable manner, that is,.provided with a collar 18 which is connected with an abutting collar 19 by means of suitable fastening devices 20. The collar 19 is formed on a hub 21 which is provided with an elongated opening 22 into which projects a crank pin 23 mounted in the eye extremity 2d of an arm 25 which is secured to the table, as shown at 26. The tension of the spiral springs 14 is such that by virtue of their engagement with the lugs 15, the concentrating table will be held in such position as to hold the crank pin 23 in the upper extremity of the elongated opening 22 when the latter is in such position that its major axis is vertical, as shown in Fig. 8.

Assuming now that the structure is in the position shown in Fig. 3, and that the operating shaft 6 which is journaled in boxes 27 and 28, is rotated in the direction indicated by the arrows in Figs. 2, 3 and 4, it is evident that the crank pin 23, and consequently the concentrating table by reason of its connection with the crank pin through the medium of the arm 25, will be moved toward the right until the major axis of the opening 22 is in the horizontal position approximately, after which the table will be moved toward the left until the crank pin engages the opposite extremity of said 6pening when it will he suddenly checked, the last named movement being brought about through the instrumentality of the leaf springs 7 and a spiral spring 29 which is mounted on a rod 30 between a tension nut 31 and ,a rigid upright member 32 which is provided with a sleeve 33 in which the rod moves freely. The extremity of this rod opposits that where the tension nut is located passes through an opening in the depending part 34 of an angle bracket 35 which is secured to the table 5. It is evident that as the table is moved toward the right from the position shown in Fig. 3, as just explained, that the spiral spring 29 as well as the upright leaf springs 7 will be placed under tension, and will impart movementto the table toward the left as soon as the opening 22 is in such position as to permit this movement. It is also evident that the sudden checking of the movement of the table toward the left due to the engagement of the crank pin 23 with the left hand extremity of the opening 22 when the latter is in the horizontal position, will cause the material on the table in the form of pulp for instance, to travel toward the left a short distance. It is also evident that as the rotation of the shaft continues, that the table will be subjected to a series of such reciprocating movements, and that the material thereon will be given a stepby step movement toward the left, as is required in tables of thischaracter in order that the, gangue may be separated from themineral values by subjecting the material to the action of a current of wash water traveling approximately at right angles to the normal travel of the material on the table when responding to the differential movement of the head motion heretofore described.

It should be explained that the lower extremities of the rods 14 loosely engage sockets formed in bottom members. 36 mounted on the stationary frame work 9 of the table, these sockets being of such shape as to allow the rigid rods to oscillate sufficiently for the purpose, since these rods are not supposed to have suflicient elasticity or yielding capacity for the purpose. Hence, their rigidity is assumed. g Having thus described my invention, what Iclaim is: Y

1. A head motion for concentrating tables comprising. in combination with a table movably mounted, an operating shaft provided with a part having an elongated opening, a crank pin connected with the table and entering said opening, means for yieldingly supporting the table to cause said pin to assume such a position in said opening that the table is moved in one direction as the shaft rotates, and spring tension means cooperating with the shaft for moving the table in the opposite direction.

2. The combination with a body mounted to reciprocate, of means for imparting differential movement to the body comprising an operating shaft provided with a hub hav ing a slot extending through its center and on opposite sides of the shaft axis, a crank pin connected with the body and extending into said slot, the body being mounted to cause the crank pin to engage one extremity of the slot when the major axis of the latter is in the vertical position, and spring tensioned means for imparting movement to the body in one direction in cooperation with the crank pin and slot construction for imparting movement in the opposite direction.

3. The combination with a structure mounted to reciprocate, of means for imparting differential, movement to the structure comprising an operating shaft, one extremity thereof having a slot extending through its center and on opposite sides of its axis, a crank pin connected with the structure and extending into said slot, the table being mounted to cause the crank pin to engage one extremity of the slot when its major axis is in the vertical position, and spring tension means for imparting movement to the structure in one direction in opposition to the movement imparted by the crank pin and slot construction.

4:. The combination with a structure mounted to reciprocate, of means for imparting differential movement to the structure,

comprising an operating shaft, one'end of which has a slot extending through and on opposlte sides of its axis, a crank pin connected with the structure and extending into the vertical position.

In testimony whereof I affix my signature.

HENRY BOLTHOFF. 

